I think it is...A or C Sorry if I am wrong. :(
Answer:
C. Charged, polar, or non-polar
Explanation:
Amino side chains, also called R groups, are classified into the categories of charged, polar, and non polar.
These classifications can be determined by the structure and elements within the R group/functional group.
Frequency is the term that describes the number of waves passing a point during a certain period of time, frequency is also measured in Hz (hertz).
Answer:
C. 200 billion
Explanation:
The milky way galaxy is estimated that there is 200 billion stars